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Related Experiment Videos

Suprascapular nerve entrapment: evaluation with MR imaging.

R C Fritz1, C A Helms, L S Steinbach

  • 1Department of Radiology, University of California, San Francisco.

Radiology
|February 1, 1992
PubMed
Summary

Suprascapular nerve entrapment is often missed in shoulder pain diagnosis. Magnetic resonance imaging can help identify perineural masses and muscle atrophy, aiding in diagnosis.

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Area of Science:

  • Orthopedics
  • Radiology
  • Neurology

Background:

  • Suprascapular nerve entrapment is an underdiagnosed cause of shoulder pain.
  • Diagnosis is often delayed until significant muscle weakness and atrophy occur.
  • The spinatus musculature (supraspinatus and infraspinatus) is innervated by the suprascapular nerve.

Purpose of the Study:

  • To investigate the utility of magnetic resonance (MR) imaging in diagnosing suprascapular nerve entrapment.
  • To identify common perineural masses associated with suprascapular nerve entrapment.
  • To correlate mass location and nerve entrapment with patterns of spinatus muscle atrophy.

Main Methods:

  • Retrospective review of shoulder MR images.
  • Identification and classification of masses adjacent to the suprascapular nerve.
  • Assessment of supraspinatus and infraspinatus muscle atrophy.
  • Correlation of mass characteristics and location with nerve entrapment and muscle atrophy.

Main Results:

  • Twenty-seven masses were identified adjacent to the suprascapular nerve.
  • The most common mass was ganglion cyst (21 cases).
  • Muscle atrophy patterns correlated with mass location and nerve entrapment site (proximal vs. distal).

Conclusions:

  • MR imaging is valuable for diagnosing suprascapular nerve entrapment.
  • Perineural masses and spinatus muscle atrophy are key imaging findings.
  • Early diagnosis can be facilitated by recognizing these MR imaging features.

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